While driving the coach home today, I noticed that the air tanks were having a hard time topping off to 120 psi at low idle; high idle, ok. While driving tanks were good and cycling. When I got home, and shut down, I noticed both tanks lost air quickly. Outside air temp is 0 f. Any ideas as to where this leak could be? All new airbags. Wasn't doing this with above freezing temps.
Thanks, Mike
my tanks only go to about 92-93 psi.. is this not good? travel light comes on about 85-88 approx..
Hey Mike,
Just a guess, possibly the air dryer is partially stuck in the purge position. There are a number of areas that could have a problem at that temperature. Time to start checking connections.
Bob
But, a leak at the dryer would not drain tanks unless the check valves are bad.
That big a leak should be audible. Fully build PSI, shut it off and go out and listen carefully.
Agree with Brett - most likely problem is
downstream of your brake air tanks. One likely suspect is the pressure regulator that controls pressure to the front 6-pack manifold. Not sure where it is located on your coach, but probably in the vicinity of the front and rear brake air tanks.
Yes, that is a problem. Your system air pressure should cycle between a low of about 90 psi (engine air compressor cut-in) and a high of about 120 psi (engine air compressor cut-out). If you do not see pressures in this range, then I would suspect a faulty D2 governor. It's a $20 part - if it malfunctions can cause BIG problems. Search this Forum for "D2 governor" for LOTS of info.
Air Governor [ForeForums Foretravel Motorcoach Wiki] (http://wiki.foreforums.com/doku.php?id=technical:air_system:d2)
DavidS, you air pressure should go to at least 120 PSI. That's the cutout for most air governors that control the air compressor. Also what Chuck said.
Water frozen somewhere in the air system ?
Can you get it inside (heated building) overnight?
If that cures it dran the airtanks and press on.
If it ice you will need to service the air dryer. First you need to fine out what is leaking.